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In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 80 questions and secures 120 marks, How many questions does he answer correctly?

30
60
50
40
Explanation:

Let the number of correct answers be x

Then, number of wrong answers = $\left(80 - x\right)$

4x – $\left(80 - x\right)$ = 120

=> 4x – 80 + x = 120

=> 5x = 200

=> x = 200/5 = 40

i.e., he does 40 questions correctly

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